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多震源同时采集技术能够有效提高采集效率,得到来自多个震源的混合地震数据,该技术能缩短采集周期,降低采集成本,但对混合地震数据直接成像会在成像结果中引入串扰噪音,影响成像质量。因此,本文在实现多震源最小二乘逆时偏移的基础上,引入构造导向滤波算子作为多震源最小二乘逆时偏移的预条件算子,沿着构造走向应用非平稳滤波在有效保护构造信息的前提下压制串扰噪音,通过共轭梯度法使得反偏移数据与观测数据之间的误差达到最小,最终得到信噪比更高的成像结果。合成数据的数值实验表明,本文所提出的方法能够有效压制串扰噪音,提高成像精度。
Multi-source simultaneous acquisition technique can effectively improve the acquisition efficiency and get mixed seismic data from multiple sources. This technique can shorten the acquisition cycle and reduce the acquisition cost. However, the direct imaging of mixed seismic data will introduce crosstalk noise into the imaging results and affect the imaging quality. Therefore, based on the multi-source least-squares inverse time migration, this paper introduces the structure-oriented filter operator as the preconditioner for multi-source least-squares inverse time migration. Applying non-stationary filtering along the tectonic strike is effective Under the premise of protecting the structure information, the crosstalk noise is suppressed, and the error between the reverse-offset data and the observed data is minimized by the conjugate gradient method. Finally, the imaging result with a higher signal-to-noise ratio is obtained. The numerical experiments on synthetic data show that the proposed method can effectively suppress the crosstalk noise and improve the imaging accuracy.